Insulator for electrically-charged wires.



Vclaro the following -to suenen n. serian, or annuleren,

M-ARYLAND.

INSULATOR FOR. ELECTBCALLY-CHARGED YIRES.

lState of Maryland, haveinvented certain new and'useful Improvements in insulators forElectrically-Charged Wires; and I do debe a full, clear, and exact description ot the invention, such as Will enable others skilled in the art to which it appertains to make anduse the same.

This invention relates 'to improvements in insulators foi-"electrically charged wires. The object ot' the invention is to provide f an insulator that shall be especially adapted to be used in positions Where it is surrounde by Wood or other inflammable material, and Which is so constructed thatit may be insulated in the inflammable surroundings in such a manner that there will be no danger of the insulator becoming loose or disengaged from the surrounding material and which will thereby prevent the 'electric wire from' coming in contact with anything except the insulator. 'y

With this and other objects in view, the invention consists of certain novel features of construction, combination and arrange ment of parts as will be hereinafter more position within the perspective, view fully described and claimed. y

In the accompanying drawings; Figure i. represents a vertical section o'l a joist 'showing this improved insulator arranged in juxtaposition ready for insertion in the opening therein; Fig. 42 represents a simiu lar view showing the insulator in operative 'oist opening; Fig. is a of the f insulator removed; Fig. 4l is a transverse section taken 4on the line of Fig. l.

In the embodiment `illustrated a tubular insulator l is shown which may bey constructed of clay or any suitable electric non-conducting material and in which electric wires vll are designed to be incased. This insulator 1 shown provided with the usual head 2 at one end thereotivhich terminates at its inner end in a shoulder 3 and this shoulder is provided with van inwardly extending socket l formed adjacent the face of the tube l and which is designed to receive oneend of an arcuate spring 5 which is mounted on the outer face of the tube l. and extendslongiti'ldinally thereof to permit said spring to yield and slide forwardly on the insertion of the' tube l in the borede Specify tion of fottere-Patent.

' Patented Feb. t, 1916.

Application lled enuary 4,'1915. Serial No. 362.

signed to receive and support it and this socket protects said spring end against eaposureand ivouldhold said, spring in operative position should the securing means at its other end vbecome detached. T he other endl of said spring is secured to said tube in any suitable or desired manner.y it being here shown mounted in a longitudinally extending groove 5l which merges into the socket 4. The outwardly bowed or bulged .face of this spring 5 is thickened to ai'ord ample strength Without interfering with its yieldability and is provided with a plurality of forwardly inclinedteeth 5 which increase in height from the outer toward the inner ends ot said. strip andare designed to engage the surroundings of the ings of the tube and thus firmly retain it in operative position. These insulators are used in insulating electric light Wires in buildings fo; which purposes bores are formed in the`joists and partitions of buildings and the insulators inserted therethrough, l i i The mode of using this insulator is by making an opening through the joist or partition in which the ilsulated Wire is to be inserted, then the insulator with the spring 5 mounted thereonis inserted in the hole or bore in the 'joist orpartition and the' hole being nearly of the same size as the diameter of the body ot the insulator the s ring will be compressed when inserted 'an the free end thereof will slide forward into` the socket 4 ofthe shoulder 3. YThe insulator v is 'forced in until the shoulder 3 comes against the fare of the opening of the partition and the electric wire Wis inserted throughthe bore of the. insulator. As soon as the insulator is inserted the resilient mein# ber 5 will come into action and the teeth thereof will engage the inner face of .the ivall of the opening in the partition and-prevent any removal of the insulator. Then the electric'nf'ire may be readily inserted in the- .having a one-piece outwardly bowed spring nietal gripping'strip secured at one end' tio the 'outer face oi said insulator, said strip being thickened interinediately of its ends whereby said gripping member is strengthgroove' in its outer face merging into said' ened without interfering with its resilienev;

2. A. tubular insulator tneleetrie airing` having@ head at one end terminating` at ita inner end in a laterally extending` shoulder. said shouldrflwing provided with an undercut forwardly extending socket arranged adjacent the'buter tare ot said insulator, said insulator hai ing a longitudinally extending .socket and forming aV continuation tlna'eol,

YSocket` said/strip being thickened interlnediately of its ends and having fo1\\'ardl projeet-ing teeth ,torlnei'll in'sad thickened portion on the outer face ot' said. strip.

In testimoni' whereotI .l have hereunto set n1 hand in presence of two subscribing witnesses;

GEORGE il. SMITH.

Witnesses J. M. BL'rrixG'roxe vCima. (l. linx 

